Originally Posted by FuJi K
If it was me, i would just do a usdm WRX ecu/harness running the ver6 longblock. If looking for more strength you should up the rods and pistons. If you don't want to pay a premium for the JDM engine, a built USDM WRX 2L with gutted intake ports will work the same.
Ver5/6 are big ports whether WRX or STi. Impreza GT in Europe with an EJ205 engine runs the same big port heads. It's not STi exclusive
I was thinking about running the 205 harness with my Ver5 Type-R.
You can get the USDM 03 harness @ WRX USA
for $350. Their swaps are fairly cheap as well. I just couldn't pass up this Type-R tho. It's in so good of condition, and only One owner with 40k on it! And I got the whole car minus the rear sheet metal.